@misc{indiciae3c1c6081be48,
  title = {Gasdynamic lasers and photon machines.},
  author = {Christiansen, W. H. and Hertzberg, A.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730055292},
  note = {Source identifier: 19730055292}
}